Wax-thread-shoe-sewing machine.



F". ASHWORTH.

WAX THREAD SHOE SEWING MACHINE.

, APPLICATION FILED JUNE 2. 1916- 1,265,986.

Patented 1115111, 1918.

UNITE TA ES PATENT ()FFIOE.

FRED AsiIWoETH, E BEVERLY, MASSACHUSETTS, ASsIGNoE, BY MESNE ASSIGNMENTS,

TO UNITED SHOE MACHINERY CORPORATION, 0F PATERSON, NEW JERSEY, A COR- PORATION of NEW JERSEY.

- Beverly, in the county of EssexandState of Massachusetts, have invented certain new and useful Improvements in Wax-Thread- Shoe-Sewing Machines; and I do hereby declare thefollowing to be a full, clear, and

exact .description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to wax thread shoe sewing machines, and more particularly to presser foot lifting mechanism for such machines. v j One object of the'present invention is to provide a wax thread sewing machine with an improvedmechanism by which the presser foot may beunlocked at any time andlifted to allow :work to be removed, inserted or adjusted.

WA further. object of .the invention is to provide an improved presser foot lifting mechanism for wax thread sewing machines 25 by. which the presser foot will be unlocked from .its work-clamping position and lifted to free the work when the machine is stopped. 1 With theseobjects'in view, the invention consists in the improved presser'foot lifting mechanism hereinafter described and set forth in the claims.

.The various features ofthe invention are illustrated. in the accompanying drawings, inwhich Figure l-is a detail view in side elevation, showing those parts of. an outsole sewing machine-which are necessary to illustrate the application of the improved presser foot mechanism thereto; and Fig. 2 is a detail view showing the relation of the presser foot lever to the manually operated plunger during the sewing operation.

The sewing machine illustrated in the y drawings is an outsole, lock stitch, curved needle machine-substantially the same in general construction, arrangement and mode of. operation as the machine illustrated and described in ,my co pending application, Serial No; 769,566, filed May 24, 1913, on whichPa'tent No. 1,233,539 issued July 17, 1917. This machine is providedwith the usual work support 10, awl 12, and presser foot 14. The presser foot 14 is mounted j upon the central arm of a three-arm presser WAx-THEEAD-sHoE-sEWING MACHINE.

' Specificationof Letters Patent. Patented May 14, 1918, Application filed. June 2, 1916. -Seria1No.'101,25 6.

foot lever, 16, 18, 20, pivoted on a stud" 21. To actuate the presser foot duringthe sewing operation an actuating lever 22 is mounted on a movable fulcrum bar 24 and connected bya link 26 with the arm 18 of the presser foot lever. The presser foot is yieldingly pressed againstthe work by a spring 28, which is connected atone end tothe machine frame, and at the other end to a link 30 attached to the lower end of the actuating lever22. The fulcrum bar 24 is slidably mounted in guides formed in the arms of a yoke 32 which is attached to the machine frame. steep pitch screw formed on the fulcrum bar,xand held between the arms of the yoke 32.; Tohold the nut 34 from rotation and thus lock the fulcrum bar from movement .A nut 34 is mounted on a at certain times duringthe operation of the machine, a locking lever 36 is pivoted to the yoke 32 and surrounds the nut 34. A roll 38 is mounted between the arms of the leverw36 and is arranged to be wedged against the bottom of the nut 34 when the between. the'guide block 50 and a collar 54 fixedon the rod 48. WVith this construction the spring 52 normally tends to move the locking lever 36 into a position to lock the fulcrum bar 24 from movement, To move the locking lever into a position to release the locking nut 30 on 'thefulcrum bar, a lever 56 is loosely mounted on the shaft 44 and carries a set-screw 58 which engages the upperface of the lever 46. A cam lever 60 is loosely mounted upon the shaft 44 and is arranged to have a lost motion connection with the lever 56. The lever 60 has an arcuate section 62 formed on its hub which interlocks with an arcuate section 64 formed on the hub of the lever 56. Shoulders on these sections are shown in engagement at 66, Fig. 1. The section 62 hasa less circumferential length than the section 64, which permits a movement of the lever relatively to the lever 60, as shown at 68. The upper end of the cam lever 60 carries a roll 70 which engages a path cam on the shaft 72 and is operated to positively rotate the lever 56 in a direction to move the locking lever 36 to the left, viewing Fig. 1, and unlock the fulcrum bar 24.

The lever 22 is operated by a cam lever 74:76 which is pivoted on a stud 7 8 and connected with the lever 22 by means of a link 80. The arm 74 of the lever 7 l -7 6 is provided witha cam roll which engages a path cam on the cam shaft 7 2. To vary the movements imparted to the presser foot, the link 80 carries. a block 82 which is adjustable in an arcuate slot 84: formed in the arm 76 0f the lever 74-76. I

' responding parts of the machine of application Serial No. 769,566, above referred to.

To permit the operative to remove or ad just the work, the presser foot mechanism is arranged to be manually unlocked and lifted from the work. The mechanism for actuating the presser-foot in this manner comprises an unlocking plunger 86 having its front end extending loosely through an opening 88 in the arm 20 of the presser foot lever which arm, in efiect, constitutes a lifting handle by which the presser foot may be raised from the work. The rear end of the plunger 86 is connected to the upper end of a lever 90 which is fixed on a pivot shaft 92 journaled in the machine frame. I The lower arm of the lever 90 is provided with a cam face comprising two portions 94; and 96, adapted to engage a roll 98 mounted on the end of the lever 56, the construction being the same as in the machine of Patent No. 1,233,539. A spring 100 is connected between the upper arm of the lever 90 and the machine frame and normally tends to hold the plunger 86 in the position illustrated in Fig. 2. Then the plunger is in this position a knob 102 threaded on the plunger 86 is removed from the face of the arm 20 of the presser foot lever, and the cam face 94: is in contact with the roll 98. To lift the presser foot from the work, the plunger 86 is pushed toward the rear of the machine and by the time the knob 102 comes into engagement with the lifting handle 20 the face 96 of the cam has acted upon the roll 98 and the fulcrum bar 24: has been unlocked. A continued movement of the plunger 86 will move the cam face 96 over the roll 98 and lift the presser foot 11 off the work. The cam face 96 is substantially concentric with the shaft 92, so that, while the presser foot is being lifted, the fulcrum bar 2 1 is'held in released position. To hold the plunger 86 centered in the opening 88 it is slidably mounted in .a sleeve 104 which is attached to an arm 106 fixed on the machine frame. The rear end of the plunger 86 is provided with an adjusting nut 108 by which it may be adjusted to prop erly time the parts.

When the machine is stopped at the completion of the sewing operation the presser foot is lifted automatically to release the work by mechanism which actuates the lever 90 as in the'm'achine of application Serial No. 7 69,566. A stopping cam 110 is mount: ed upon the cam shaft 72 and arranged to cooperate with a cam lever 112. During the normal operation of the machine the cam lever is held out of the path of the cam 110, the face of the cam lever resting against the concentric portion 11 1 on the cam shaft.- When the machine is being stopped, the lever 112 is shifted transversely of .the shaft into the path of the cam 110, rides up an inclined face 116and engages a stop 118. The lever 112 is pinned to a shaft 120 journaled in the machine frame and has a lug 122 which is'positioned to engage a lug 124: on a lever 126 loosely mounted on the shaft 120; The lever 126 is connected by a link 128 with the upper arm of a bell crank 130 pivoted on a shaft 132. A headed bolt 134 is mounted at the pivotal connection of the link 128 and bell crank 130, which is engaged by a 5 set screw 136 mounted in a lever 138 pinned to the shaft 92 on which the bell crank 90 is fixed. With this construction, when the cam lever 112 is moved to the right, viewing Fig. 1, in traveling'up the inclined face 116 100 of the cam, the upper end of the lever 138 will be moved to the right. At the same time the bell crank 90 will be oscillated to move the cam face 96 into contact with the roll 98 and simultaneously shift the plunger 86 to 5 lift the presser foot 14.

The invention having been thus what is claimed as newv is:

1. A shoe sewing machine, having, in combination, a work support, a presser foot lever 110 provided with a lifting handle, a presser foot on said lever, means acting automatically to lock and unlock the presser foot lever during each cycle of operations of the machine, a manually operable plunger mounted to move independently of said lifting handle, and means actuated by said plunger for unlocking the presser foot lever.

2. A shoe sewing machine, having, in combination, a work support, a presser foot lever provided with a lifting handle, a presser foot on said lever, means acting automatically to lock and unlock the presser foot lever during each cycle of operations of the machine, a manually operable plunger mounted to move independently of and into engagement with said lifting handle, and means actuated by said plunger during its independent movement for unlocking the presser foot lever.

described, v

3. A shoe sewing machine, having, in compendently of and into engagement with said bination, a Work support, a presser foot lever lifting handle and means acting upon stopprovided with a lifting handle, a presser ping the machine to move said plunger to foot on said lever, means acting automatilift the presser foot lever and to unlock the 5 cally to lock and unlock the resser foot presser foot lever during the independent lever during each cycle of operations of the movement of the plunger. machine, a plunger mounted to move inde- FRED ASHWORTH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. i 

